Feeding mechanism for sewing-machines.



W. A. MACK.

FEEDING MECHANISM FOR SEWING MACHINES.

. v APPLICATION FILED APR. 25, 1911. 1,089,420.

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W. A. MACK. I FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED APR. 25, 1911.

1,089,420. I Patented Mar.10,1914.

2 SHEETS-SHEET 2.

s, WITNESSES. INVENTUR 7/ I //'I BY his ATTORNEY UNITED sTArEs PATENT OFFICE.

WILLIAM A. MACK, 0F CLEVELAND, OHIO, ASSIGNOR TO THE STANDARD SEWING MACHINE COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

FEEDING MECHANISM FOR SEWING-MACHINES.

Patented Mar. 10, 1914.

Serial No. 623.271.

To all whom it may concern:

Be it known that I, WILLIAM A. MACK,

citizen of the United States, and resident-of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Feeding Mechanism for Sewing-Machines, of which the following is a specification.

My invention has for its object to provide an improved feeding mechanism for sewing machines that will be simple in construction, efficient in operation, and capable of convenient and accurate adjustment for regulatin the length of stitch to be made.

To 1; 's end the invention consists in the novel construction, arrangement and combinations of parts as hereinafter set forth in detail and particularly pointed out in the appended claim.

Referring now to the accompanying drawings forming part of this specification, in which- Figure 1 is a bottom plan of a sewing ma- Similar reference characters indicate like parts in the several figures of the drawings.

The frame of the machine comprises the usual bed-plate 1 and its upwardly projecting arm 2.

The feed device is of the so-called' fourmotion type and comprises a feed-bar 3 having at its upper side the usual toothed work-engaging dog 4. Vertical or up-anddown movement is imparted to this feed device by means of a rock-shaft 5 suitably journaled at the under side of the bed-plate and having two crank arms 6, 6', projecting therefrom in a substantially horizontal direction, the arm 6 having connection with the front end .of thefeed-bar through the medium of a. link 7, and the arm 6' having connection through the medium of a. pitman 8 with an actuating device or eccentric 9 on the ug ipler driving shaft 10, as shown in Fig. 2. e rocking movement imparted to the shaft 5 from the eccentric 9 operates through. the connections 6-7 to impart the Fig.

required vertical or up-and-down movements to the feed device, in a manner as will be clearly understood by reference to Fig. 3.

Horizontal or backward and forward movement 1s imparted to the feed device by means of a second rock shaft 11 which is also suitably journaled at the under side of the bed-plate and provided with two crank arms 12, 12, one of which projects therefrom in a substantially vertical direction and has direct pivotal connection with the rear end of the feed-bar as shown in Fig. 3. and the other of which projects therefrom in a substantially horizontal direction and has connection through the medium of a pitman 13 with a second actuating device or eccentric 14 on the driving shaft 10. The rocking movement imparted to the shaft 11 from the eccentric 14 operates through its arm 12 to impart the required horizontal or backwardand-forward movement to the feed device, in a manner as will also be clearly understood by reference to Fig. 3. v

In order to adjust the horizontal or working stroke of the feed device, whereby the length of stitch may be regulated, the connection of the pitman 13 with the crank arm '12 is shiftable lengthwise of the latter in order that the movement imparted by the pitman to said crank arm and thereb to the connecting feed-device may be varie The means for so shifting the pitman relatively to the crank arm is as follows: An adjust able device 15, in the form of a short bar, is slidably mounted in a transversely arranged seat 16 formed in the bed-plate at the front side thereof and is provided with a depending arm 17 having connection through a double link 18 with the lower end of the pitman 13, which latter as here shown connects with a sleeve 19 slidably supported on the crank arm 12'. An adjusting screw 20 located at the upper side of the bed-plate in a position in front of the arm 2 engages the device 15 through an elongated slot 21 in the bed-plate and serves as a convenient means for shifting said device and holdin the same in adjusted position. As the sai feed or stitch regulating screw 20 is at the front side of the bed-plate and the connection of 105 dropno ping the connections for the said link below the loop-taker shaft as clearly shown in Fig. 2.

What- I claim is In a feeding mechanism for sewing machines, the combination of a driving shaft and two arallel rock-shafts, an arm on each rock-sha two independent actuating devices on the driving shaft, a connection between each actuating device and one of said arms, a feed-bar, a second arm on each rockshaft, one of which arms is connected to one end of the feed-bar to impart a horizontal movement thereto and the other arm connected through a link with the opposite end of said feed-bar to impart a vertical movement thereto, a sleeve between one of said actuating device connections and the arm operated by it on the rock-shaft which moves the feed-bar horizontally said sleeve being movable longitudinally on said arm, the sewing machine bed-plate provided with a transversely arranged seat and with an elongated slot at the surface of the bed-plate communicating with said seat, an adjusting bar mounted in said seat in the bed-plate to move horizontally, an adjusting screw engaging said bar through the slot 'in the bedplate, and a link connecting said bar with the sleeve whereby the position of said sleeve on its carrying arm may be shifted to change the throw of the rock-shaft on which it is mounted and thereby the horizontal movement of the connected feed-bar.

Signed at Cleveland, in the county of Cuyahoga and State of Ohio, this 22d day of April, A. D. 1911.

CHAS. C. EMMONS, A. S. RODGERS. 

